The optical near field of a high- Q and ultrasmall volume photonic crystal nanocavity is visualized with a subwavelength resolution by using a scanning near-field optical microscope (SNOM) operating at the same time in collection-scanning mode and in interaction-scanning mode. It is shown that the nanocavity resonant mode is selectively visualized by using the SNOM interaction-scanning mode while the whole electromagnetic field surrounding the nanocavity is probed using the SNOM collection-scanning mode. The different optical near-field images are compared in light of a three-dimensional numerical analysis and we demonstrate an unexpected mode coupling at the cavity resonance. © 2008 American Institute of Physics.
|Titolo:||Subwavelength imaging of light confinement in high- Q /small- v photonic crystal nanocavity|
|Data di pubblicazione:||2008|
|Appare nelle tipologie:||1.1 Articolo su Rivista/Article|